Frontal oscillatory activities reflect stable stimulus and response conflicts
作者单位：School of Education & Center of Mental Health and Psychological Counseling Zunyi Normal College
会议名称：《第二十一届全国心理学学术会议》
会议日期：2018年
学科分类：0710[理学-生物学] 07[理学] 071006[理学-神经生物学]
关 键 词：electroencephalography（EEG） frontal neural oscillations stimulus and response conflicts
摘 要：Cumulative evidence suggests that practice has significantly dissociable influences on stimulus and response conflicts in the congruency tasks(such as the Stroop and color-word Flanker tasks). However, the effects of practice on stimulus and response conflicts in a typical Flanker task are unclear. To address this question, in the present study, behavioral and electroencephalography(EEG) data were recorded from twenty-nine healthy human participants while they were performing a 2:1(two targets are mapped into one response key) letter Flanker task in a practice design. Behavioral results show that response time(RT) significantly reduced with practice but neither the stimulus conflict nor the response conflict were reduced after practice. Brain oscillatory results are consistent with the RT patterns and show that(1) the frontal theta(4–7 Hz, 0.52–0.82 s) activity significantly declined for each trial type after practice, which suggests the enhanced links between stimuli and responses after practice, and(2) the frontal alpha(8–11 Hz, 0.52–0.82 s) activity was constant for both stimulus and response conflicts with practice, suggesting a stable mechanism of stimulus and response conflicts in the letter Flanker task. Altogether, these findings demonstrate stable behavioral and neural oscillatory characteristics of stimulus and response conflicts in a typical Flanker task.